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Kinetics of isothermal crystallization and subsequent melting behavior of PTT/PA12 blend
Author(s) -
Asadinezhad A.,
Jafari S. H.,
Khonakdar H. A.,
Böhme F.,
Hässler R.,
Häussler L.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26808
Subject(s) - crystallization , materials science , nucleation , crystallinity , differential scanning calorimetry , isothermal process , kinetics , supercooling , thermodynamics , avrami equation , chemical engineering , polymer chemistry , crystallization of polymers , composite material , physics , quantum mechanics , engineering
The kinetics of isothermal crystallization along with subsequent melting behavior of melt‐mixed immiscible binary blends of poly(trimethylene terephthalate) (PTT) and polyamide‐12 (PA12) were investigated by means of differential scanning calorimetry. Three macrokinetic models of Avrami, Tobin, and Malkin were used which could adequately describe isothermal crystallization kinetics of the blends as well as the neat components. However, the commonly used Avrami model provided more consistent data for the system of interest. Based on the half‐time of crystallization, one could conclude that PTT crystallizes more rapidly than PA12. The kinetic parameters suggested that blending had a distinct influence on reducing the rate of isothermal crystallization particularly at medium degrees of undercooling. From reciprocal crystallization half‐time, it was concluded that over the temperature range covered; the samples crystallized inside the nucleation‐controlled region. The secondary nucleation mechanism generally prevailed in the PA12 isothermal crystallization whereas in PTT, the primary crystallization mechanism dominated. With respect to the position of melt transitions, blending was proven to exert only small effects, however, it reduced the crystallinity of both constituents particularly that of PA12 significantly. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007